Water　oxidation　is　a　critical　reactionin　artificialphotosynthesiswhich　is　limited　by　a　high　reaction　energy　barrier　and　often　requiresmatching　cocatalysts.　Dual　cocatalysts　Co3O4　and　Pt　are　combined　with　a　perylene　diimide　(PDI)　polymer,　accomplishinga　photocatalytic　O-2　production　rate　of　24.4　mmol　g(-1)　h(-1)　under　visible　light　irradiation,which　is　a　5.4-fold　enhancement　compared　with　PDI　alone.　Moreover,the　apparent　quantum　yield　of　the　O-2　evolution　reactionreaches　6.9%　at　420　nm　and　remains　1.2%　at　590　nm.　The　dual　cocatalysts-constructedinterfacial　electric　fields　provide　an　anisotropic　driving　force　forphotogenerated　holes　to　Co3O4　and　electronsto　Pt,　synergistically　improving　the　spatial　charge　separation　efficiencyfor　water　oxidation.　Co3O4　molecules　serve　asactive　sites　for　the　water　oxidation　reaction　to　improve　the　utilizationof　photogenerated　holes　on　the　surface.　This　work　provides　a　valuabledemonstration　of　the　interaction　process　and　mechanism　of　cocatalysts,guiding　the　selection　of　cocatalysts　for　high-efficiency　solar　energyconversion.